scores = {'张三': 100, '李四': 90, '王五': 80}
print(scores.keys())
keys = scores.keys()
print(list(keys), type(keys))
value = scores.values()
print(value, type(value))
print(list(value))
item = scores.items()
print(item, type(item))
print(list(item))
#   字典元素的遍历
for key in scores:
    print(key)
    print(scores[key])
    print(scores.get(key))
